PTEROMALIDAE OF N.W. EUROPE 305 



faintly yellowish ; venation testaceous, the parastigma, and usually the point of junction of 

 the marginal and stigmal veins, darker. Length 2-6 to 3 mm. 



In addition to the structural characters which are common to all species of this group, fulvicoxis 

 has the following : 



Body relatively elongate and slender, the thorax 1-7 to i-8 times as long as broad, the gaster 

 lanceolate. 



Head in dorsal view (Text-fig. 234) only 1 -8 to 2 times as broad as long ; temples not obviously 

 converging behind the eyes ; eyes about 1-2 times as long as broad, separated by about 1-3 

 times their own length ; malar space approximately two thirds the length of an eye ; breadth 

 of oral fossa 1-47 to 1-7 times the malar space ; clypeus rather small, not strongly transverse, 

 at most 1 -5 times as broad as long, alutaceous or reticulate all over, its anterior margin moder- 

 ately but not strongly curved. Antennae with combined length of pedicellus and flagellum 

 practically equal to the breadth of the head ; scape about 3-8 times as long as broad, its length 

 equal to or slightly greater than the transverse diameter of an eye ; pedicellus twice as long as 

 broad, as long as or very slightly longer than the first funicular segment ; funicle proximally 

 not stouter than the pedicellus, thickening slightly distad, its first segment 18 to 2 times as 

 long as broad, second segment slightly longer than broad, the following segments quadrate or 

 very slightly elongate ; clava slightly broader than the funicle, twice as long as broad, nearly 

 as long as the three preceding funicular segments together. 



Head and thorax with rather stronger sculpture than in the other species, hence rather dull ; 

 on the mesoscutum, axillae, and scutellum, the transverse walls of the areoles are slightly stronger 

 than the other walls, so that the sculpture tends to have a transversely-rippled or substrigose 

 appearance. Scutellum with five to seven pairs of bristles ; frenum often with some delicate 

 wrinkles in addition to the reticulation. Dorsellum very finely but quite strongly reticulate, 

 relatively dull. Propodeum finely but relatively strongly reticulate, only slightly shiny. 

 Fore wing with speculum open below. 



Gaster lanceolate, slightly to obviously longer than head plus thorax, 2-8 to 4 times as long 

 as broad ; basal tergite usually with a longitudinal fovea on each side, separated by a convex 

 median ridge ; tip of hypopygium situated about half way along the gaster. 



$. Differs from the female as follows : 



Antennal scape and flagellum hardly at all darkened dorsally ; scape broader (length : 

 breadth about 3-2 : 1) ; pedicellus a trifle shorter ; flagellum filiform ; combined length of 

 pedicellus and flagellum very slightly greater than the breadth of the head ; clava nearly 2-5 

 times as long as broad, but only as long as the two preceding funicular segments together. 



Gaster sublinear ; about as long, but only about half as broad, as the thorax. 



Holotype $. England : ? Norfolk, Merton, iv.1914, from Helicomyia saliciperda 

 (Duf.) (C. B. Williams), in BM(NH). 



Paratypes. Same data as holotype, 1 <$, 4 $ ; Kent, unlocalized, from 

 Rhabdophaga sp. on Salix fragilis L., 3 $, 1933 (H. F. Barnes), in BM(NH). 



Gastrancistrus triandrae sp. n. 



$. Differs from that of fulvicoxis sp. n. as follows: 



Anterior margin of clypeus strongly produced, almost angulate medially. Antennal pedi- 

 cellus i-8 to 2 times as long as broad, distinctly longer than the first funicular segment, which 

 is 1-4 to i-6 times as long as broad, therefore somewhat shorter than in fulvicoxis ; the second 

 funicular segment is quadrate or hardly elongate, the following segments are quadrate, or the 

 fifth very slightly transverse. 



Thorax slightly shorter, about 1-65 times as long as broad. Dorsellum delicately reticulate 

 and moderately shiny. Speculum of forewing partly or completely closed below. 



Gaster relatively shorter, as long as or rather shorter than head plus thorax, about 2-8 times 

 as long as broad. 



